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Benjamin KietzmanFrançois Saint-Jacques
344ed4bed67
Benjamin Kietzman authored and François Saint-Jacques committed 0afacd121ce
ARROW-7382: [C++][Dataset] Insert missing directories in FileSystemDataSourceDiscovery::Make

Previously an omitted interceding directory (providing `/a=1/b=2/data` but not `/a=1` and `/a=1/b=2`) resulted in clobbered partition information. Now if any directories are missing they will be inserted

Closes #6027 from bkietz/7382-Dataset-Refactor-FsDsDisc and squashes the following commits:

0d448659d <Benjamin Kietzman> rename GatherAncestry->AncestorsFromBasePath
e8733665b <Benjamin Kietzman> iwyu: utility
91e1ade98 <Benjamin Kietzman> review comments
95db47855 <Benjamin Kietzman> ARROW-7382:  Insert missing directories in FsDsD::Make

Authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>